Resiliently expanded scraper device for removing carbon from valve guides



Feb. 5, 1952 H. SPANG 2,584,634

- RESILIENTLY EXPAND SCRAPER DEVICE FOR REMOVING CARBO ROM VALVE GUIDES Filed March 14, 1947 Md 12 k i Fmai F163 z aa & N

INVENTOR.

\A/ILLlAM H. SPANG /pm wldw ATTORNEY Patented Feb. 5, 1952 UNE'E' STATES PATENT FFIE RESILIENTLY EXPANDED SCRAPER DEVICE FOIQ B EMOVING CARBON FROM VALVE GUIDES Application March 14, 194*], serial no. 724,766

8 Claims.

This devices relates, as indicated, to a device for removing carbon from valve guides, but has reference more particularly to a tool or device which has been especiall' designed to 'remeve carbon deposits from the walls of the guides in which the stems of valves of internal combustion engines slide.

A primary object of the invention is to provide a device of the character described which is effective not only to break or loosen the carbon do posits on the Walls of such guides, but also to scrape and remove the carbon deposits thus bro: ken or loosened.

Another object of the invention is to provide a device of the character described having a novel roller for loosening or breaking the carbon deposits. V V I A further object of the invention is to provide a device of the character described having novel spring means for pressing the aforesaid roller against the wall of the guide.

A still further object of the invention is to provide a device of the character described, in which the aforesaid spring means can be moved in such a manner as to increase or decrease the degree of pressure exerted upon the Wall of the guide by the roller, and in which the spring means is of such form or contour as to permit use of the dc vice on valve guides of various diameters.

A still further object of the invention is to provide a device of the character described which consists of a minimum number of parts which are inexpensive to manufacture, and which can be quickly and easily assembled and cleaned.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same, a I

Fig. 1 is a front elevational View of a device embodying the novel features of the invention;

Fig. 2 is a side elevational View of the device;

Fig. 3 is a cross-sectional View of the device, taken on the line 3-3 of Fig. 1, but showing the manner in which the device is used to remove carbon deposits from a valve guide;

Fig. 4 is an end elevational View, taken on the line 4-4 of Fig. 1, and

Fig. 5 is a cross-sectional view, taken on the line 5-5 of Fig. 1.

Referring more particularly to-the drawings, it will be seen that the device for breaking and cleaning carbon comprises a stem consisting of two parts I and 2, which are spaced axially from each other, and are rigidly interconnected by a shaftor pin 3, which is oiiset from the axis of the parts I and 2. The part I of the stem has rigidly secured to its upper end a knob or handle 4, having a knurled edge 5 to facilitate rotation or movement of the parts I and 2 in an axial direction.

The part I of the stem has a longitudinally extending recess 6 in the periphery thereof, which extends the entire length of the part I, and is increased in depth adjacent its lower end, to form an arcuate recess, as at I. a

The part 2 of the stem is similarly provided with a recess 8 in its periphery, which extends the entire length of the part 2, and is in a1ign= m'ent with the recess 5. The lower end of the recess 8 is increased in depth to provide an in clined cam surface 9, the function of which will be presently explained. v

slidably mounted on the stem I, for movement along such stem, is a handle or knob Ill of considr'ably greater diameter than the handle or knob 4; and having aknurled peripher I I, which facilitates rotation of the handle as wen as move: ment of the handle along the stem I. I

The handle or knob ID has a radially-extend ing opening I2, in which the flange I3 of a carbon wiper element I4 is disposed. The element I 4 is' preferably made from spring steel of roc tang'ular cross section, and comprises an upper portien I5 which is disposed in the recess 6, which thus constitutes a track for longitudinal movement of the element M, an intermediate portion I6 which is normally bowed outwardly, and an inclined lower end H, which is disposed in the recess 8, which thus constitutes a track for longitudinal movement of the end I1. The portion I6 of the element I 4 is provided with a radially-inwardly extending portion I8, of arcu ate contour, the purpose of which will appear hereinafter.

Loosely mounted on the shaft 01 pin 3 for free rotation about such shaft, is a roller I9, having its peripheral surface 253 knurled, and its ends slightly tapered, as at 2| and 22; The diameter of the roller I9 is such that a portion thereof pro-'- jec'tsslightly beyondthe peripheral surface of the stem parts i and 2, as clearly shown in Fig. 3.

Having thus described the construction of the device, its use or operation will now be briefly described.

The device is designed primarily to break and remove the carbon which becomes deposited on the inside 61* Wall of the guides for the stems of valves in internal combustion engines and the like. For this purpose, the parts i and 2 of the stern of the device are inserted into the valve stem guide, from which it is desired to remove the carbon deposit.

As these parts of. the stern are thus inserted in the valveguide, the element M of the device is pressed radially-inwardly by the wall of the valve guide G, as shown in Fig. 3, thus causing the roller It to be resiliently pressed against the opposite side of the wall or" the valve guide. Then, by a conjoint vertical and rotary movement of the stem parts i and 2 by means of the handle or knob the projections formed by the knurling 29 of the roller 19 function to break the carbon on the wall of the valve stem guide, into small.

particles. These particles can then bescraped from said wall by rotation of the element [4 which functions as a scraper for this=purpose, the rotation of such element being efiected by rotation of the knob or handle it. The element It thus functions both as a scraper, and as a means of resiliently maintaining the roller 19 in contact with the wall of the valve stem guide.

By movement of the element It up or down by means of the handle or knob is, various portions thereof may be brought into contact with the wall of the valve guide, thereby increasing or decreasing the degree of pressure exerted upon the wall of the guide by the roller it. This vertical adjustment of the element is is also designed to permit the device to accommodate itself to valve guides of difierent diameters. The degree of adjustment of compression is increased by virtue of the'moveinent of the lower end I? of the element it on the inclined cam surface 9 of the stem part 2. The tapered ends Hand 22 of the roller 19 facilitate vertical movement of the roller in the valve guide.

It may be noted that the adjustment of the element 14 is controlled from the outside of the valve guide, close to the turning handle or knob e. The portion 'i of the recess is designed to receive the portion [8 of the element Id, at such time when the device is to be used in scraping carbon from valv guides whose Wall diameter is only slightly greater than the diameter of the stem parts I and 2. The portion I8 of the element that various changes in the shape, size and arrangement of parts may be resorted to, Without departing from the spirit of my invention, or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. In a device of the character described, a handle, a stem extending from said handle and having a longitudinally-extending recess therein,

It also prevents distortion of the ele- 2. A device, as defined in claim 1, in which said stem comprises axially-spaced portions, and said roller is rotatable about a shaft which interconnects the portions of said stem.

3. A device, as defined in claim 2, in which both parts of said stem have longitudinally-extending recesses, in alignment with each other and constituting said first-mentioned longitudinally-extending recess and said spring has one end thereof disposed in each of said recesses, whereby the spring is contrained to move in the track formed by said recesses.

4. A device, as defined in claim 3, in which one of said aligned recesses has an inclined surface forming a cam surface against which one end of said spring is adapted to bear, said spring end being movable along said cam surface, whereby the adjustment of compression of the spring is controlled.

a roller mounted for rotation about an axis paral- 5. In a device of the character described, a handle, a stem extending from said handle, a roller mounted for rotation about an axis parallel to the axis of said stem and having surface projections adapted to break carbon deposits on the walls of valve stem guides, and means for resiliently urging said roller into engagement with said wall, said means comprising a spring having sharp edges adapted to scrape the broken carbon from said wall as the stem is rotated, means for shifting said spring to a plurality of selected positions along said stem, and means responsive to said shifting movement to radially expand the spring, whereby to increase the pressure of said roller against said wall.

6. A device, a defined in claim 5, in which said stem has a longitudinally extending groov in the peripheral wall thereof, and said spring has a portion thereof disposed in said groove.

7. In a device of the character described, a handle, a stem extending from said handle, a roller mounted for rotation about an axis parallel to the axis of said stem and having projections adapted to break carbon deposits on the walls of valve stem guides, means comprising a spring resiliently urging said roller into engagement with said wall, which spring also functions to scrape the broken carbon from said Wall, said spring being movable to a plurality of positions axially along said stem, and means responsive to said axial movement to radially expand the spring, whereby to increase the pressure of said roller against said wall.

8. A device, as defined in claim 7, in which said stem has a recess therein, and said spring has a portion thereof disposed in said recess.

WILLIAM H. SPANG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

